What's your protein intake with that diet though? A person with 80kg needs around 120-160g of protein a day (depending on activity etc), that seems tricky if the source of your protein is non-animal based.
I am generally not a huge fan of the historical line of thinking. 6 generations ago you died significantly earlier with not a great health along the way. It is a very recent development to live to (avg) 83. Would the strongest man in your region perform at a high level if he wasn't doing manual labour and died at 95?